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In 1899 Radon-220 by an American scientist named Robert B. Owens and a British scientist named Ernest Rutherford, noticed the radioactivity of thorium compounds could be blow away by a breeze. Radon 219 on the other hand was found by German scientist Friedrich O. Geisel in 1904.

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Today because Radons highly radioactive properties we use Radon for chemotherapy uses. By sealing it in a glass tube and inserting this into a tumor the radioactive particles can bee safely dispersed into the cancerous area.

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Radon is a colorless, and odorless  gas. While it is chemically inert it is highly radioactive.
It melts at -96 F and boils at -79.1 F.

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Radon has an atomic mass of 86, an atomic weight of 222, and can be found in the noble gas family. (Britannica)

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Radon also has eight valence electrons and an atomic radius of 2.20. Radon is a metalloid sitting at the bottom of the stair step.

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Radon is very rare in nature because it has a short half life and its parent atom radium is rare as well. It can also be found though as a natural decay product of Uranium.

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One place it occurs naturally is in traces of the atmosphere near the ground because of seepage from soil and rocks which contains minute amounts of Radon.

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Encyclopædia Britannica. (n.d.). Radon (Rn). Britannica School. Retrieved March 10, 2022, from https://school.eb.com/levels/high/article/radon/62436

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Royal Society of Chemistry. (n.d.). Radon - element information, properties and uses: Periodic Table. Radon - Element information, properties and uses | Periodic Table. Retrieved March 10, 2022, from https://www.rsc.org/periodic-table/element/86/radon#:~:text=It%20is%20chemically%20inert%2C%20but%20radioactive.&text=Radon%20decays%20into%20radioactive%20polonium,treating%20the%20disease%20in%20situ.

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1. Radon is the number one causer of lung cancer aside from nicotine in the U.S.
2. The name Radon comes from its parent element Radium.
3. Radon is not only colorless and odorless but also flavorless.

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All Radon particles have 86 protons, and the most common version Radon 222 has 134 neutrons along with 86 electrons. Radon also has three natural isotopes  from each of the three natural radioactive-disintegration series.

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[Xe]4f^14 5d^10 6S^2 6P^6